Organizations can have resources associated with them, e.g. workspaces, templates, provisioner keys, groups, members. If you attempt to delete an organization with one of these resources, you will get an error which is correct behavior:

If you delete a specific resource, say, the associated workspace - but other resources still remain attached - you get the same error that still references the resource you just deleted, this time with a zero value.

We should tidy up this error message so that it doesn't mention 0 workspaces.